SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0af727bf27e56e7c0c04ddea99b56919ca4bced174b47e179b77e983a3cacc1' 
  AND token = 'q6F3uV4elWQmgQK7EeMF06LxIP/l6nISacSI1/Qpo+Y=' 
  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