SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '969d4c86f1a1f2d12793ed8a1902939a60ed4a0051da59bb04e59c49ccd8a20b' 
  AND token = 'b4dFJF+6ooRAtQ31BwDUEyCoGoQJkKhhqYRhUXJBpy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

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