SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3ae6f116f685de686d1939ca5262770aabbfe71326a11836760a8fb0ab4925d' 
  AND token = 'BGnA7erCse3DYFlUyvfYWKZ2e1njsmg/vi8HQVmBwRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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