SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e660afb439a6fa938ea76a2c417debc3b099937e16e1a8b2832149c07dcbf5e4' 
  AND token = 'd4lKZP5VYqngSaVQUcLchzam/kHA0ubZb3CIffDE+A4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

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