SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a58df193962f8c4a6efe69e6418e9edc3c9c0d98ffa27830365820c598420fb9' 
  AND token = 'DsgR7i138ZDmP9sc0u7BckEGv/uijLZt1eO+CMW9N0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

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