SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6035c11e3bbaaf186298a4de5ef15f361568df8f5d8fe028fe7a27c49d4ed03' 
  AND token = 'Yvr+h7Q33tqVSsxdC2uxqDua5Iep3z1naCaTyB+01po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

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