SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '754d90cfd25d839d4ba6b7894c8df27af7679b4e451bf37403adebe8dfcc3fc2' 
  AND token = 'P7xG+Rl5LJxdX+AfTKOip7CuTGpgTw5PFDijAchgVys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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