SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aeedf36e989c262b9dccbab479f57d090e51e8bbd329c8547117536832b44c6' 
  AND token = 'n0JvFluSGWmdnMMlbTV+Hl3bOueh1YxGppjmu5BD784=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

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