SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae384b6f6f8caa70f9ae5bf6f6bcc61bfe6ab0c71f237ce610151cf27b2e5339' 
  AND token = 'gTWJXnf52QHWiKra7Z5sejIuJOT2G8+Pa2mNukj4jxg=' 
  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