SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b10d04fabbb2780fdcce9fa8fa8052fa1595246bc19c6bf571f34acf4a2781fd' 
  AND token = 'cKwUBGWlv4yE+4I8LFJPDlCYunU4imkfhJqtihlnCdo=' 
  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