SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abacdb23dd52264cd8ce5c4754e00a6135c4764b672fa758af8e493e488bbad9' 
  AND token = 'MJJTGp7bj7ffW9wkRmLerHgHm48+v6RtquK75sfcTNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

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