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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b302c272b18e3318155b50bbcb38abdc64a4eecc450aedf9497db17cf55e117' 
  AND token = 'X302+YIiqscHeroaqpBTn/NZVk5QXnF6uc1gdyXaA58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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