SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32408240fe865523067a2fdd5c58b5eb4000311eb4508a5da464d898e4a9f898' 
  AND token = '82+mLnsJbWZFFhSz+DyHJ+ZBfTtI9xaE9fJCdKlcqh8=' 
  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