SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b513dac7ecf488e89762207e6630ccaa1a4de013653a3cb4ab2a090d234e112' 
  AND token = 'Q4LqQ0l0lyjNmf3PDoiK1H/NHlf2QGpjwGuBrSQa3dQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

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