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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e530cbd941c1b0700296f8a9d1d2f71d567b9b4e3d495d1e55b7e57bc7ff3b2' 
  AND token = 'yQwhhP1FbZ8A/svZDR4mhl14ISn417ByqWDX/tq3A0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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