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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ae7427f40a4943fe1aba7fb7895ceb333b6297f69c82339d39e132068627776' 
  AND token = 'yo8VWswTWp7W5uggUk7EpalodsaYvH+w6JJrBSuBFcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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