SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d5753e97f0ace6dbca96a99b2632f3e60c75233b560f80bc6f65521f6f27fe2' 
  AND token = '/u7BZ7/y6kFszWoZnDt6CblRVpOVg8cPp1mUN3CWSU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

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