Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6572fc262c7f606a9dbccf0a78b66ea1f2b24c0eb6fe51fbbd54aeb4cca92c20' 
  AND token = 'eLlnG3pz8LFuG0cDvqUCyMJjdoOnPABGxwZSA9n+R2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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