SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71982ad5f0126dad5e203c7158cd2f71ba52337fb8536d2aeebfb60d657ab77b' 
  AND token = 'd0nbQh1MErPoJJZSSqXuAgX/k1bZz/yEkL2OU8O77rs=' 
  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