SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a5a846bff7320debd61f4612741b65778b47d0636fc987e814ebab8b34bbb54' 
  AND token = 'mGfUeBipZM/Ua7LCXlMB/FTD34N7r5bA4xAABILRqG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

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