SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc002971b6a16ed3f86efb08dd850e4f0416274f3bb68cd17000ff9d0082751f' 
  AND token = 'O1n+EeWAwEW70RfiJjcIj5TUVMDsnsucg+Q+VtcduHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

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