Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b073c9c03b5481c4dfee803473603f646456799b521fac9ff1d1a1c1d49dd4c9' 
  AND token = 's94MkqdoLVmXu4YkIjUbFXE9YA5fItt3F7mT5MOWuxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}