SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a4c33b55a29200aa7825f15a75a8f84f021ed1a513429f53d580b32ae1f62c6' 
  AND token = 'oU731HwWdUH/nRDlVlSwEov4JfpYcN5yVaOnabKIFLM=' 
  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