SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf04c8a3fb722574b7a614bce6737df4cf95b5dd4ff7783aea7b5007e2829eac' 
  AND token = 'J0gsw6zZJ74IcxCgSkBTVqZVDxhVvAxUPIciQZY1o1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00109

JSON explain

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