SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77eb8a9eb107faffd6d6beb32bd8fb6ffdb9b0489856f046d7217f4311a4a866' 
  AND token = 'j3d/EESyVc2KTZDv1/wpX+j3Z6+sglRIffJ5BJ7ml7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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