SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f58e326c4ac84aadb69e1a1e2ef86c3bfcddf7eac1aca4d21e517df4039fa87' 
  AND token = 'sXxNbmu+cT+KKWreO+18ZMLxMaqBnE2VsxuYVRI+mlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

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