SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ff3b487a208e880e8931e99e924ad2b4f7301247a253323c820dc2f3a5113b0' 
  AND token = '+KowthamLhi3nJZQMbP/vfY9VbyBIxSc1j+Es6F/eKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

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