SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0aae424f359da67baffe4d2560042b25d01d3049bdb457ae4d053435230ae0c' 
  AND token = '60mhxsIdKxWs8v/KGMqO0cv9geRCXk3f+BJlP2tDRzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

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