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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2b8b2c65d53928138fe4672ae203fffaeed74ae41524e41160905a34ece33f9' 
  AND token = 'miYmz/VKoa2zoTU7hpl7+YYL6/aQWaYp9m/4Tci3B6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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