SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42bd4e92711e29c730f7ea5485bfdb5fadc943e5c61f984bbbf8363622f942d1' 
  AND token = 'kzVogItahVNH7zy/BjcyF46T36G13XX9Iwq+n1/JMc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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