SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c61814f98107670b3c67bfe386d00ce453c7e2056b42340f198841aeec90f0f' 
  AND token = '9vJDH6Y//VtwrdADiMuTXQh88X9Q2W4+Yev0J5wcrAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

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