SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '903283c518e56ecd4b8ff149eae96ab3e59578de21a58d86de25bca53d163563' 
  AND token = 'WRFSXkXmuidhyZ9h5OlY+NtggXON+VU/BrbL8nQLrn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

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