SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcdd1185e9f1c3bf413cb5a07269aa98748618aaefc32b9c022715f266ce499f' 
  AND token = 'LiV3qIIHqZ3BKRkKQRTtXsJNdhpNGV3Um7yOfMLZ2IE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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