SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcc7511cbd5f93e3f6310e25c393d5644c22981493295c9056b21147fb7926b6' 
  AND token = 'g5eu7jUb6F/vzG0KJgrtjUcP7TdIvKO4+QG5erw0PMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

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