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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8799aae3aa04d1795511fd3437118de1383ade8449adaae0d633bc7baa7c7254' 
  AND token = 'Blw0WUwXBN+b9g4rK0dcUag2Pqpb55z5zWwKDfXqqfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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