SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84d1d4cb1b3484262c7a062b71477f96a9ea891be615ceb8a74d73c8d987c30f' 
  AND token = 'LOxedyy7Grszj3+qBBcR/Hnz71HIzxkUaiZwha+FAIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

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