SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33d2b0346fd77aa82e0a46011da3dae59716f7194eb548919b5c93ca45085671' 
  AND token = 'GGwStP+8M9dOAgDj4D9jcXodIoKdiWYBNPJuL/7lZnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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