SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a09a2d080327657960146d33d2917c36ec1ff28da65220561924e9ac1837d161' 
  AND token = 'oC5XLq2IJlVSsmz7HqqtYRgNnx7Ivhj6Y3alaEVfUZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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