SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05f590403668683f55b3cc89221ef6b3d53a27ec6289d062851c2fee96884d83' 
  AND token = '4gaKESPogrADx36G+baTI3CLczD9B1tty+XouxPHjds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

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