SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3bbdbedad22f277228112a3cb5a85f003ecc96646844f6a01d15211b636a8fc' 
  AND token = 'hAyHhroJujsHibntz8VX9/FUl8IIiA/3+9zAyhxGFgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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