SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '414832efe6e47f73f408b251a99fbd3feb497135184df29c0de8240136dfb350' 
  AND token = 'fP7quH0sbgqXibNvToDRsVrjV/9Y+2C1UyB7Quv5lOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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