Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00043d741a216b4d73308b0aaa3cd774a69733f9b0fdc59c33a281d816647d21' 
  AND token = 'U+3r7k/bKNwhMkFkT5EjGnLKpg4GOerTFjJ9Gnj9Eu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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