SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3272e257ead555e24f7a72d7e2c05f4e0a395f7202e72c4dc2f367986b15c1df' 
  AND token = 'MVFXIZBJmgcKDxNFTcCrGEUeyrLKHIHNnpk/iUqg7gM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

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