SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c710a441438c48918423aa905d0d955ff8637b8af18928b07c67649d5bbcede' 
  AND token = 'W/2X35B7dKQEKIEGe5MfEx/Cun7Bvm6fpWjQuLXhcWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

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