SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f28d54fd6b5e8c045a5abf8f62d673806203b7370d482db06eb6fa0ea18216b8' 
  AND token = 'Y6WHtpWYP8+qoLSG98b7QfhxAxr/rtwipOuBsaKKJPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

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