SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '431eb19c2e1455a0e6a358226242659530ca22c9a2423581b49b781db3aea99c' 
  AND token = 'fsg5r/rbhzxuWW+Mxzm5uTSRWKGsd3s+5Ha2m2Lu4QA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

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