SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cdc1be3f310d39d25ea14dd54c978b9bce4c69119f31c5d7673fb231a3647c5' 
  AND token = 'CzQ+s+Mzh39Oma/WBqriJxHVqAbiq6/WP0oh29GHHZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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