SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1aa69b9e2fead8648622c131f96306043ba7337031e2cfd62e47cb5df7ae356d' 
  AND token = 'Jd3y2WqKIsv5cK4t8OhwXI8dSg9TfMnqgZ+KbFjEQYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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