SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdb172429b5d4e3e4a87fe74f34b89165be8459ab3322914863a70c996848f48' 
  AND token = 'gPTza1aaWy+ylx4LJlMjzdH7cLmKitr7ZNCltQnh1wE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

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