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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d030a0aab43e9c6bf24cffe858666a346a8c466fac253f4f6122c323f27e13c' 
  AND token = '8bySaRyeFctSaJWuqOQ9k+qxwHqsbaQnSbB9m4A5zl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00077

JSON explain

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