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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93871d5127aa9f9dfb9155bd4526afdb600c99f7a08bd9f35d5045919aa31681' 
  AND token = 'sVTq3WjbkTxMQjU9sJCxgC55EDg//Bia5VfQqT9FkF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}