Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec535d6210465d1c2a75df64a59b055fddfb78bfea5d2fd914dcc373124150ff' 
  AND token = 'OOoEiH8gQmFUQmlxC3FhOYUHRXiUPNaOuB2RMJR9Bkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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