SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5928993514b3a0219ed130e0b6ae21a722e8fbd64406dffa1ba502596cfa348a' 
  AND token = 'a0HmhY9paLK9tQ54CCcFChkjDl+gWDPWrvEPVjaPiZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

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