SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4227efc0d18312a04a638f8cb21c9c3300f14369f8b7da7fae3b169af527d3c4' 
  AND token = 'WgxGpcQ/WWn2dC1VHGTmtXg+L5TNB+FjtYwFyBZUgEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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