SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '443094a603d0fdd85375f9a9e12a4b2fd9130a34950da30401203b8fa56e44f6' 
  AND token = 'q2GSBHWnQ/x9kHKoOwCblEwUMIpqSVP9Wuzx71vrRVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

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