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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '445113f9cddc5137afea6a28ed6cd10eff99e52e1b91a8d6a041735b24c17515' 
  AND token = 'agoQtiiVTLViJXqqQs8ZeYwesrVh2dIjXIEn+uXl9TE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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