SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faecd7ef357eff02e864c566989bce8410ad922fe2233438c0dbec9197a01b8a' 
  AND token = 'Xe3EFPr7ArCXqYmDbOOyOttWdHS2tzP2Z7S5lamnVUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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