SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6964c0bd2571528061def00ce49d99962887bb08b63b81e38586ad8e810713a2' 
  AND token = 'jEz5men0vnONF0GLPPPMeZy3881Ay2S/2y82q4uBScE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

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