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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f838356b94dc1234cf92790dd34e2423f023100b0711108f59e193260298e7b' 
  AND token = 'bmLHJzf0DEPj1dY24DNrvj7IhcwMyakciroIv0jGj14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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