SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8057c93e20441a0eada5ce7d9338ca5abec8bd763a9a0fc95e59644510192f73' 
  AND token = '+WVzBZZF30iGQEz8NY7GpijUG9v1cXpDM3rqhQJ9u/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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