SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ddd849be67c33b7f1b5c9345306b0abee4e117bb69577dfb025b5164b9f7dad' 
  AND token = 'xbo+yZF5PE1+TsVGU6tvF40YWIASBR4KU8+shZUNrKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

Explain
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE Impossible WHERE noticed after reading const tables