SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ee4a9c770a14f3cadcd5b6c61ce9488383becd545c1fa3c9a060705b6f071a7' 
  AND token = 'iDwYNiK9H8C/uYm05fHtX9iR/3ilGSJvN5xrI7XW18o=' 
  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