In a bowl, whisk together the olive oil, lemon juice, and salt until the mixture is well blended. Dip the shrimp briefly into the mixture to coat lightly. Heat the pan and add the shrimp in a single layer without crowding. Sear for 1 minute. Decrease the heat and continue cooking for 1 minute longer. Turn the shrimp, increase the heat again, and sear for 2 more minutes, or until golden. Keep the shrimp warm on an ovenproof platter in a low oven. Cook the rest of the shrimp in the same way. When all the shrimps are cooked, arrange on a platter and serve immediately.