SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '340e5c4a3f8d9d0ba3fa2b4319ab8969cd6dc4125b4d3412d6c1a87276741317' 
  AND token = 'vgf09r36wmTWQff+dLKdg333hU/QllnZ68VAIXBpYLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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