Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3438eb1dcb59f1aeccd925c26789da039c26c0125cfaddab293de3d2f0e80e99' 
  AND token = 'WVdYjHDLo47TqdXD82RY9wCl0mkpsoN6JvRnPzQ+AdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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