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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff9359ed4d3fc10d926b205ee7ae95c92a8ea70065086cf0c54695e5b181c2b8' 
  AND token = 'DwI/wQCXeWZ48lRwTTqmm+TlB6BgKs2I/VesD3UZkZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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