SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8154164cf5dff3c579b83dd4165354caa8de5fe9d32e60c020e23c2c8aae1d90' 
  AND token = 'G46vKzSesisCwlv/THB+tUUZf8jq3iVrpj6FlA2UkJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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