SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bef828c35b0d10fa4e97aae3842df343c81d486a21457a06b9a81b666123155c' 
  AND token = 'm6GRDMdfgSFBg//JEnfp8sw0FduABNg/aGB/XTc4aiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

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