SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9920b8c9a33342680d758fb16c9852497aa5666e0571b1314ccaebc301c39b59' 
  AND token = 'OBG25C2Gg9Zu2zw+JLBgQJVwrzluZOepdbrZ63bWEjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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