SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a736e98eabae151dcd73d102b5879be7f244389baa2d13076cff06b8e2d8a014' 
  AND token = 'CYX9pSIH9I8XrOul8KlcXzGFwEPCuJOXdCv07Q+AeMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

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