SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '610d960d96ea939c953df6e8f87debe382043fff840101f654a8d6b51219426c' 
  AND token = 'Vh2xtT8Ai+TzanlmlgGouUAdw/gJ24Viq0IYmx5sI1Y=' 
  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