SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '437b5b4413eaf1d0dbb85593eb49b433bee8de80fbc9240c019b2b966cc8609a' 
  AND token = 'eT9p3NfstLNvrF1M+4Bc+zYzUYGtlG14sWMlKSqWwvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

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