SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a25b098877a202c25d248f6762736d8659131e30f863a070f35fba601e4cf13' 
  AND token = 'DlKoD8pnVRwbqr0XS6/1NKWBXBYjZQ8iIUiIsza06+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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