SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '061a433c733342888365bf42bea04f19eb649aefff1e9b623ec3ea89a8894d08' 
  AND token = 'ycGMJOOYeZ4FpCBJIPwj54nmBhINpl+9gFqt1F1ZLco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

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