SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37476a83a2f66dbbdb3e37a4fc20d3f3172f967382f49c75774949a880fca037' 
  AND token = 'YZDe0zZU7mkG/SsB0ESL9kV8CqTGoE0dnkVYv4UvmKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00083

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