SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7d2ab3aa164e111c654ff5d086955b4ba71025f8ca6035682bb743c1f22b724' 
  AND token = 'WPGgEfHvpJUZAyVXHyBYBQVA0BYYpuZ4Iy0zYSfe9cU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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