SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6baba43fe2befac27d650725404b1469867627b3159b61b327c317ff27066c4e' 
  AND token = 'OzRQrxGoEtwe+dP7IF9PSMjskFgeO4aDR8SkBscg8W4=' 
  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