SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7098a59a3523ff6638979fcc7e6b4d9939517d2723c44a1d9e6b48c0eb09a477' 
  AND token = 'UZUNKQYSrSWzJJW9B2vpuSy50TvuyO+JRYIXGfGru3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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